499 lines
13 KiB
C++
499 lines
13 KiB
C++
/*
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* synergy -- mouse and keyboard sharing utility
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* Copyright (C) 2002 Chris Schoeneman
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*
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* This package is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* found in the file COPYING that should have accompanied this file.
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*
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* This package is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include "CMSWindowsScreenSaver.h"
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#include "CMSWindowsScreen.h"
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#include "CThread.h"
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#include "CLog.h"
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#include "TMethodJob.h"
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#include "CArch.h"
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#include "CArchMiscWindows.h"
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#include <malloc.h>
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#include <tchar.h>
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#if !defined(SPI_GETSCREENSAVERRUNNING)
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#define SPI_GETSCREENSAVERRUNNING 114
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#endif
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static const TCHAR* g_isSecureNT = "ScreenSaverIsSecure";
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static const TCHAR* g_isSecure9x = "ScreenSaveUsePassword";
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static const TCHAR* const g_pathScreenSaverIsSecure[] = {
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"Control Panel",
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"Desktop",
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NULL
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};
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//
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// CMSWindowsScreenSaver
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//
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CMSWindowsScreenSaver::CMSWindowsScreenSaver() :
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m_wasSecure(false),
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m_wasSecureAnInt(false),
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m_process(NULL),
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m_watch(NULL),
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m_threadID(0),
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m_active(false)
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{
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// detect OS
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m_is95Family = false;
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m_is95 = false;
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m_isNT = false;
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OSVERSIONINFO info;
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info.dwOSVersionInfoSize = sizeof(info);
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if (GetVersionEx(&info)) {
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m_is95Family = (info.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS);
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if (info.dwPlatformId == VER_PLATFORM_WIN32_NT &&
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info.dwMajorVersion <= 4) {
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m_isNT = true;
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}
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else if (info.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS &&
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info.dwMajorVersion == 4 &&
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info.dwMinorVersion == 0) {
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m_is95 = true;
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}
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}
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// check if screen saver is enabled
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SystemParametersInfo(SPI_GETSCREENSAVEACTIVE, 0, &m_wasEnabled, 0);
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}
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CMSWindowsScreenSaver::~CMSWindowsScreenSaver()
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{
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unwatchProcess();
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}
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bool
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CMSWindowsScreenSaver::checkStarted(UINT msg, WPARAM wParam, LPARAM lParam)
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{
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// if already started then say it didn't just start
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if (m_active) {
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return false;
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}
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// screen saver may have started. look for it and get
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// the process. if we can't find it then assume it
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// didn't really start. we wait a moment before
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// looking to give the screen saver a chance to start.
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// this shouldn't be a problem since we only get here
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// if the screen saver wants to kick in, meaning that
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// the system is idle or the user deliberately started
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// the screen saver.
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Sleep(250);
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// set parameters common to all screen saver handling
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m_threadID = GetCurrentThreadId();
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m_msg = msg;
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m_wParam = wParam;
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m_lParam = lParam;
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// we handle the screen saver differently for the windows
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// 95 and nt families.
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if (m_is95Family) {
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// on windows 95 we wait for the screen saver process
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// to terminate. get the process.
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DWORD processID = findScreenSaver();
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HANDLE process = OpenProcess(SYNCHRONIZE, FALSE, processID);
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if (process == NULL) {
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// didn't start
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LOG((CLOG_DEBUG "can't open screen saver process"));
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return false;
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}
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// watch for the process to exit
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watchProcess(process);
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}
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else {
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// on the windows nt family we wait for the desktop to
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// change until it's neither the Screen-Saver desktop
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// nor a desktop we can't open (the login desktop).
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// since windows will send the request-to-start-screen-
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// saver message even when the screen saver is disabled
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// we first check that the screen saver is indeed active
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// before watching for it to stop.
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if (!isActive()) {
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LOG((CLOG_DEBUG "can't open screen saver desktop"));
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return false;
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}
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watchDesktop();
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}
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return true;
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}
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void
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CMSWindowsScreenSaver::enable()
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{
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SystemParametersInfo(SPI_SETSCREENSAVEACTIVE, m_wasEnabled, 0, 0);
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// restore password protection
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if (m_wasSecure) {
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setSecure(true, m_wasSecureAnInt);
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}
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// restore display power down
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CArchMiscWindows::removeBusyState(CArchMiscWindows::kDISPLAY);
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}
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void
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CMSWindowsScreenSaver::disable()
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{
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SystemParametersInfo(SPI_GETSCREENSAVEACTIVE, 0, &m_wasEnabled, 0);
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SystemParametersInfo(SPI_SETSCREENSAVEACTIVE, FALSE, 0, 0);
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// disable password protected screensaver
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m_wasSecure = isSecure(&m_wasSecureAnInt);
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if (m_wasSecure) {
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setSecure(false, m_wasSecureAnInt);
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}
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// disable display power down
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CArchMiscWindows::addBusyState(CArchMiscWindows::kDISPLAY);
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}
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void
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CMSWindowsScreenSaver::activate()
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{
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// don't activate if already active
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if (!isActive()) {
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// activate
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HWND hwnd = GetForegroundWindow();
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if (hwnd != NULL) {
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PostMessage(hwnd, WM_SYSCOMMAND, SC_SCREENSAVE, 0);
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}
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else {
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// no foreground window. pretend we got the event instead.
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DefWindowProc(NULL, WM_SYSCOMMAND, SC_SCREENSAVE, 0);
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}
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// restore power save when screen saver activates
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CArchMiscWindows::removeBusyState(CArchMiscWindows::kDISPLAY);
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}
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}
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void
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CMSWindowsScreenSaver::deactivate()
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{
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bool killed = false;
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if (!m_is95Family) {
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// NT runs screen saver in another desktop
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HDESK desktop = OpenDesktop("Screen-saver", 0, FALSE,
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DESKTOP_READOBJECTS | DESKTOP_WRITEOBJECTS);
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if (desktop != NULL) {
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EnumDesktopWindows(desktop,
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&CMSWindowsScreenSaver::killScreenSaverFunc,
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reinterpret_cast<LPARAM>(&killed));
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CloseDesktop(desktop);
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}
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}
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// if above failed or wasn't tried, try the windows 95 way
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if (!killed) {
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// find screen saver window and close it
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HWND hwnd = FindWindow("WindowsScreenSaverClass", NULL);
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if (hwnd == NULL) {
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// win2k may use a different class
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hwnd = FindWindow("Default Screen Saver", NULL);
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}
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if (hwnd != NULL) {
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PostMessage(hwnd, WM_CLOSE, 0, 0);
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}
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}
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// force timer to restart
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SystemParametersInfo(SPI_GETSCREENSAVEACTIVE, 0, &m_wasEnabled, 0);
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SystemParametersInfo(SPI_SETSCREENSAVEACTIVE,
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!m_wasEnabled, 0, SPIF_SENDWININICHANGE);
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SystemParametersInfo(SPI_SETSCREENSAVEACTIVE,
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m_wasEnabled, 0, SPIF_SENDWININICHANGE);
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// disable display power down
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CArchMiscWindows::removeBusyState(CArchMiscWindows::kDISPLAY);
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}
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bool
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CMSWindowsScreenSaver::isActive() const
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{
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if (m_is95) {
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return (FindWindow("WindowsScreenSaverClass", NULL) != NULL);
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}
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else if (m_isNT) {
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// screen saver runs on a separate desktop
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HDESK desktop = OpenDesktop("Screen-saver", 0, FALSE, MAXIMUM_ALLOWED);
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if (desktop == NULL && GetLastError() != ERROR_ACCESS_DENIED) {
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// desktop doesn't exist so screen saver is not running
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return false;
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}
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// desktop exists. this should indicate that the screen saver
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// is running but an OS bug can cause a valid handle to be
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// returned even if the screen saver isn't running (Q230117).
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// we'll try to enumerate the windows on the desktop and, if
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// there are any, we assume the screen saver is running. (note
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// that if we don't have permission to enumerate then we'll
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// assume that the screen saver is not running.) that'd be
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// easy enough except there's another OS bug (Q198590) that can
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// cause EnumDesktopWindows() to enumerate the windows of
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// another desktop if the requested desktop has no windows. to
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// work around that we have to verify that the enumerated
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// windows are, in fact, on the expected desktop.
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CFindScreenSaverInfo info;
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info.m_desktop = desktop;
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info.m_window = NULL;
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EnumDesktopWindows(desktop,
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&CMSWindowsScreenSaver::findScreenSaverFunc,
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reinterpret_cast<LPARAM>(&info));
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// done with desktop
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CloseDesktop(desktop);
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// screen saver is running if a window was found
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return (info.m_window != NULL);
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}
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else {
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BOOL running;
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SystemParametersInfo(SPI_GETSCREENSAVERRUNNING, 0, &running, 0);
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return (running != FALSE);
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}
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}
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BOOL CALLBACK
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CMSWindowsScreenSaver::findScreenSaverFunc(HWND hwnd, LPARAM arg)
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{
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CFindScreenSaverInfo* info = reinterpret_cast<CFindScreenSaverInfo*>(arg);
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if (info->m_desktop != NULL) {
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DWORD threadID = GetWindowThreadProcessId(hwnd, NULL);
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HDESK desktop = GetThreadDesktop(threadID);
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if (desktop != NULL && desktop != info->m_desktop) {
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// stop enumerating -- wrong desktop
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return FALSE;
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}
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}
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// found a window
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info->m_window = hwnd;
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// don't need to enumerate further
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return FALSE;
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}
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BOOL CALLBACK
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CMSWindowsScreenSaver::killScreenSaverFunc(HWND hwnd, LPARAM arg)
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{
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if (IsWindowVisible(hwnd)) {
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HINSTANCE instance = (HINSTANCE)GetWindowLong(hwnd, GWL_HINSTANCE);
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if (instance != CMSWindowsScreen::getInstance()) {
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PostMessage(hwnd, WM_CLOSE, 0, 0);
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*reinterpret_cast<bool*>(arg) = true;
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}
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}
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return TRUE;
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}
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DWORD
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CMSWindowsScreenSaver::findScreenSaver()
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{
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// try windows 95 way
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HWND hwnd = FindWindow("WindowsScreenSaverClass", NULL);
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// get process ID of process that owns the window, if found
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if (hwnd != NULL) {
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DWORD processID;
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GetWindowThreadProcessId(hwnd, &processID);
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return processID;
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}
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// not found
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return 0;
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}
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void
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CMSWindowsScreenSaver::watchDesktop()
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{
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// stop watching previous process/desktop
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unwatchProcess();
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// watch desktop in another thread
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LOG((CLOG_DEBUG "watching screen saver desktop"));
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m_active = true;
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m_watch = new CThread(new TMethodJob<CMSWindowsScreenSaver>(this,
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&CMSWindowsScreenSaver::watchDesktopThread));
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}
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void
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CMSWindowsScreenSaver::watchProcess(HANDLE process)
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{
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// stop watching previous process/desktop
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unwatchProcess();
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// watch new process in another thread
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if (process != NULL) {
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LOG((CLOG_DEBUG "watching screen saver process"));
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m_process = process;
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m_active = true;
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m_watch = new CThread(new TMethodJob<CMSWindowsScreenSaver>(this,
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&CMSWindowsScreenSaver::watchProcessThread));
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}
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}
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void
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CMSWindowsScreenSaver::unwatchProcess()
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{
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if (m_watch != NULL) {
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LOG((CLOG_DEBUG "stopped watching screen saver process/desktop"));
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m_watch->cancel();
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m_watch->wait();
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delete m_watch;
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m_watch = NULL;
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m_active = false;
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}
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if (m_process != NULL) {
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CloseHandle(m_process);
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m_process = NULL;
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}
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}
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void
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CMSWindowsScreenSaver::watchDesktopThread(void*)
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{
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DWORD reserved = 0;
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TCHAR* name = NULL;
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for (;;) {
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// wait a bit
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ARCH->sleep(0.2);
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if (m_isNT) {
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// get current desktop
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HDESK desk = OpenInputDesktop(0, FALSE, GENERIC_READ);
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if (desk == NULL) {
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// can't open desktop so keep waiting
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continue;
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}
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// get current desktop name length
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DWORD size;
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GetUserObjectInformation(desk, UOI_NAME, NULL, 0, &size);
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// allocate more space for the name, if necessary
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if (size > reserved) {
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reserved = size;
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name = (TCHAR*)alloca(reserved + sizeof(TCHAR));
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}
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// get current desktop name
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GetUserObjectInformation(desk, UOI_NAME, name, size, &size);
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CloseDesktop(desk);
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// compare name to screen saver desktop name
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if (_tcsicmp(name, TEXT("Screen-saver")) == 0) {
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// still the screen saver desktop so keep waiting
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continue;
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}
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}
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else {
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// 2000/XP have a sane way to detect a runnin screensaver.
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BOOL running;
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SystemParametersInfo(SPI_GETSCREENSAVERRUNNING, 0, &running, 0);
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if (running) {
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continue;
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}
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}
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// send screen saver deactivation message
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m_active = false;
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PostThreadMessage(m_threadID, m_msg, m_wParam, m_lParam);
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return;
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}
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}
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void
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CMSWindowsScreenSaver::watchProcessThread(void*)
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{
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for (;;) {
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CThread::testCancel();
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if (WaitForSingleObject(m_process, 50) == WAIT_OBJECT_0) {
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// process terminated
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LOG((CLOG_DEBUG "screen saver died"));
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// send screen saver deactivation message
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m_active = false;
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PostThreadMessage(m_threadID, m_msg, m_wParam, m_lParam);
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return;
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}
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}
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}
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void
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CMSWindowsScreenSaver::setSecure(bool secure, bool saveSecureAsInt)
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{
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HKEY hkey =
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CArchMiscWindows::openKey(HKEY_CURRENT_USER, g_pathScreenSaverIsSecure);
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if (hkey == NULL) {
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return;
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}
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const TCHAR* isSecure = m_is95Family ? g_isSecure9x : g_isSecureNT;
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if (saveSecureAsInt) {
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CArchMiscWindows::setValue(hkey, isSecure, secure ? 1 : 0);
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}
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else {
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CArchMiscWindows::setValue(hkey, isSecure, secure ? "1" : "0");
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}
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CArchMiscWindows::closeKey(hkey);
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}
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bool
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CMSWindowsScreenSaver::isSecure(bool* wasSecureFlagAnInt) const
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{
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// get the password protection setting key
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HKEY hkey =
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CArchMiscWindows::openKey(HKEY_CURRENT_USER, g_pathScreenSaverIsSecure);
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if (hkey == NULL) {
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return false;
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}
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// get the value. the value may be an int or a string, depending
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// on the version of windows.
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bool result;
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const TCHAR* isSecure = m_is95Family ? g_isSecure9x : g_isSecureNT;
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switch (CArchMiscWindows::typeOfValue(hkey, isSecure)) {
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default:
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result = false;
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break;
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case CArchMiscWindows::kUINT: {
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DWORD value =
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CArchMiscWindows::readValueInt(hkey, isSecure);
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*wasSecureFlagAnInt = true;
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result = (value != 0);
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break;
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}
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case CArchMiscWindows::kSTRING: {
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std::string value =
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CArchMiscWindows::readValueString(hkey, isSecure);
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*wasSecureFlagAnInt = false;
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result = (value != "0");
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break;
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}
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}
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CArchMiscWindows::closeKey(hkey);
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return result;
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}
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